how an fbi investigation brought down the man in charge of the nation's secrets. and steven spielberg and daniel day lewis talk about reviving lincoln. that's on "nightline." >> stay with us. >>> well, a new device could help doctors diagnose the most deadly form of skin cancer quickly and accurately. it has the potential to save patients from unnecessary biopsies. >> as an avid runner she logs plenty of miles under the east bay sun, but a decade ago while she was eight months pregnant the sun caught up with her. >> the biopsy was this big. i ended up having close to 40 staples this my arm. it was a big scar on my arm. it was stage 1 melanoma. >> she still carries that scar and a growing number of smaller ones. evidence of her on going battle to stay a step ahead of skin cancer. >> i am here once every six months and he does a body scan on me, and often times he finds things he has to biopsy and i have the scars to show it. >> but today this dermatologist will check out several small moles on her skin with a noninvasive technology. it promises to cut the number of